Composite high temperature piezoelectric ceramic material and preparation method thereof

A ceramic material and high-temperature piezoelectric technology, applied in the field of composite high-temperature piezoelectric ceramic materials and their preparation, can solve the problems of bismuth ion volatilization, low-voltage electrical coefficient, low resistivity, etc. stable effect

Active Publication Date: 2017-04-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing bismuth layered structure materials still have many deficiencies, such as low piezoelectric coefficient d 33 , the volatilization of bismuth ions is serious at high temperature, etc., and the comprehensive performance cannot fully meet the requirements
BiFeO 3 Material compared to CaBi 4 Ti 4 o 15 The material has a high piezoelectric coefficient d 33 and Curie temperature, but its low resistivity at high temperature limits the BiFeO 3 Applications of materials at high temperatures

Method used

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  • Composite high temperature piezoelectric ceramic material and preparation method thereof
  • Composite high temperature piezoelectric ceramic material and preparation method thereof
  • Composite high temperature piezoelectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this embodiment, analytically pure Bi 2 o 3 , Fe 2 o 3 Powder preparation of BiFeO 3 (Pure BFO for short) ceramics.

[0039] The preparation steps are: 1. the analytically pure Bi 2 o 3 , Fe 2 o 3 The powder is weighed according to the molar ratio of 1:1, mixed into the ball mill jar, and analytically pure absolute ethanol (accounting for about two-thirds to three-quarters of the volume of the ball mill jar) is added into the ball mill jar, and put into the ball mill Ball mill at 300 rpm for 8 hours.

[0040] 2. After the ball milling, pour the absolute ethanol containing the powder into a glass dish, and put it in a 140-degree oven for drying. After the powder is dried, use a mortar to grind it, then pour it into a corundum boat, and put it Put it into the muffle furnace for pre-burning, the pre-burning temperature is 850 degrees, and the pre-burning time is 2 hours.

[0041] 3. Add 0.5wt% polyvinyl alcohol of the total weight of the powder to the powder i...

Embodiment 2

[0047] In this embodiment, the analysis of pure CaCO 3 、 Bi 2 o 3 、TiO 2 Powder preparation of CaBi 4 Ti 4 o 15 (Pure CBT for short) ceramics.

[0048] The preparation steps are: 1. the analytically pure CaCO 3 、 Bi 2 o 3 、TiO 2 The powder is weighed according to the molar ratio of 1:2:4, mixed into the ball mill jar, and analytically pure anhydrous ethanol (accounting for about two-thirds to three-quarters of the volume of the ball mill jar) is added into the ball mill jar, and put Go into ball mill and ball mill with the rotating speed of 300 rpm for 8 hours.

[0049] 2. After the ball milling, pour the absolute ethanol containing the powder into a glass dish, and put it in a 140-degree oven for drying. After the powder is dried, use a mortar to grind it, then pour it into a corundum boat, and put it Enter the muffle furnace for pre-burning, the pre-burning temperature is 800 degrees, and the pre-burning time is 2 hours.

[0050] 3. Add 0.5wt% polyvinyl alcohol o...

Embodiment 3

[0060] In this example, the BiFeO of Example 1 and Example 2 3 、CaBi 4 Ti 4 o 15 Powder preparation of CaBi 4 Ti 4 o 15 -0.2BiFeO 3 (referred to as CBT-0.2BFO) ceramics.

[0061] The preparation steps are: 1. the BiFeO obtained in Step 2 in Example 1 and Step 2 in Example 2 3 Powder and CaBi 4 Ti 4 o 15 The powder is weighed according to the molar ratio of 1:5, mixed into the ball mill jar, and analytically pure anhydrous ethanol (accounting for about two-thirds to three-quarters of the volume of the ball mill jar) is added into the ball mill jar, and put into Ball milled for 8 hours at a speed of 300 rpm in a ball mill.

[0062] 2. After the ball milling, pour the absolute ethanol containing the powder into a glass dish, and put it in a 140-degree oven to dry. After the powder is dried, add 0.5wt% of the total weight of the powder to the powder Polyvinyl alcohol is used as a binder, and after grinding again, it is pressed into a ceramic disc with a diameter of 13 ...

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Abstract

The invention discloses a composite high temperature piezoelectric ceramic material. The composite high temperature piezoelectric ceramic material includes two-phase ceramic, one phase is CaBi4Ti4O15 ceramic, and the other phase is BiFeO3 ceramic, the general formula is CaBi4Ti4O15-xBiFeO3, wherein x is 0.2-0.4. The invention also discloses a preparation method of the composite high temperature piezoelectric ceramic material. The piezoelectric constant and resistivity of the composite piezoelectric ceramic material are both greater than those of the single-phase CaBi4Ti4O15 piezoelectric ceramic material, so that compared with the single-phase CaBi4Ti4O15 piezoelectric ceramic material, the composite piezoelectric ceramic material is more suitable for preparation of piezoelectric sensors and piezoelectric actuators working under a high temperature condition. Also the preparation method has the advantages of stable process, simple operation, no need for special equipment and harsh conditions, and easy mass production.

Description

technical field [0001] The invention belongs to the field of inorganic piezoelectric materials, and in particular relates to a composite high-temperature piezoelectric ceramic material and a preparation method thereof. Background technique [0002] The widely used piezoelectric material is mainly PZT (PbZr0) with perovskite structure. 3 -PbTi0 3 ) and PT (PbTi0 3 )Material. However, the Curie temperatures of PZT and PT systems are around 300-350°C and 460-490°C, respectively. And the piezoelectric instability caused by depolarization caused by temperature rise makes the upper limit of its working temperature generally 1 / 2 of the Curie temperature Tc, so the service temperature of PZT and PT piezoelectric ceramics is generally 200 degrees The following are only suitable for use under normal conditions. With the development of industries such as automobiles, aerospace, and steelmaking, piezoelectric devices need to be used at temperatures of 350-400 degrees, or even above...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B41/88
CPCC04B35/475C04B41/009C04B41/5116C04B41/88C04B2235/94C04B2235/96C04B2235/327C04B41/0072
Inventor 郑鹏艾哈迈德.侯赛因张伟飞徐玉青袁国亮
Owner NANJING UNIV OF SCI & TECH
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